TROPICAL WIND AND TEMPERATURE ANALYSIS.
AIR FORCE GLOBAL WEATHER CENTRAL OFFUTT AFB NEBR
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The AFGWC objective computer tropical wind and temperature analysis program produces gridded wind and temperature analyses from 850-50mb. The analysis technique is the method of successive correction to a first guess field. First guess fields are derived from persistence, climatology and a blending of gridded data from the Northern Hemisphere upper air analysis program. Validated wind and temperature observations are used to correct the first guess fields in the analysis. The correction formula effectively treats all aircraft observations over a small area as one composite observation and all fixed observations as another composite observation which prevents several aircraft observations from masking out an observation from a fixed station. A special technique is used to eliminate spurious divergence in the wind analyses. Author